Section 1- Matter and Change

Unit 1 – Matter and Energy

What is chemistry?

Chemistry:

the study of the composition, structure,

and properties of matter, the process that

matter undergoes, and the energy

changes that accompany these processes.

Chemicals:

any substance with a definite composition.

Examples: H2O and H2O2

Matter: anything with mass and volume.

Weight: Mass:

Force of Gravity

on an Object(Measured with a scale)

Amount of

Matter in an

Object(Measured with a balance)

Matter and Its Properties

Atom: Smallest unit of an element…

Element: A pure substance that CANNOT be

broken down into a simpler substance (one

type of atom)

Example: Cu or He

Compound: A substance that can be broken

down into a simpler substance (2 or more

elements chemically bonded together)

Example: H2O or H2SO4

Physical Property

Measured without changing the substance

Intensive

DOES NOTdepend on the

amount

Extensive

DEPENDS on the

amount

Melting Point, Density,

Freezing point

Volume, Mass, Energy

Chemical Property

Behavior of a substance interacting with another

(Get a NEW substance as a result)

Coal Burning Iron Rusting

Comparison of physical and chemical

properties

Matter and Its Properties

Physical Change: Chemical Change:

Same substance present

BEFORE and AFTER

the change

Produces

ONE or MORE

new substances.

Matter and Its Properties

Indicators of Chemical Change

1. Precipitate (solid formed)

2. Gas is given off

3. Color change

4. Change in energy (Hot OR Cold)

5. Light given off (emission)

Evidence of a chemical change

Classification of Matter

HomogeneousMaterials

Elements

Is it the same

throughout?

Is it a

combination

of things?

Can it be separated

in to smaller

substances?

Classification of Matter

Types of Mixtures

Pure Substances

Groups = COLUMNS Periods = ROWS